Better than my explain ... wikipedia  http://en.wikipedia.org/wiki/Thread_(computer_science)#Multithreading 

Check that for sure will be a GPU base version of freesurfer, today in day image processing=GPU , GPU cards has hundred of cores and can do parallelism ...

Regards,

Hugo Segura

On Fri, Jul 27, 2012 at 9:48 AM, Mr U <mru258@yahoo.com> wrote:

thank you for reply.
fsl and freesurfer are image processing for mri raw images.
they use as a command and has not any gui and accept image and analyze configurations as command parameters.

can you explain multi threaded app plz
best regards

mru